Simple Apex Controller with CRUD and FLS

## apex-crud-fls.txt
This simple controller (without CRUD and FLS) ...

public with sharing class AccountController {

    @AuraEnabled
    public static List<Account> findAll() {
        return [SELECT id, name, Location__Latitude__s, Location__Longitude__s
            FROM Account
            WHERE Location__Latitude__s != NULL AND Location__Longitude__s != NULL
            LIMIT 50];
    }

}

... should be rewritten like this (With CRUD and FLS):

public with sharing class AccountController {

    @AuraEnabled
    public static List<Account> getAccounts() {

        String [] fields = new String [] {
            'Id',
            ’Name',
            ’Location__Latitude__s',
            ’Location__Longitude__s'
        };

        Map<String,Schema.SObjectField> m = Schema.SObjectType.Account.fields.getMap();

        for (String field : fields) {

            // Check if user has permission to view field
            if (!m.get(field).getDescribe().isAccessible()) {
                throw new System.NoAccessException()
                return null;
            }
        }

        return [SELECT id, name, Location__Latitude__s, Location__Longitude__s
            FROM Account
            WHERE Location__Latitude__s != NULL AND Location__Longitude__s != NULL
            LIMIT 50];

     }

}